Printed 'Ministerio de Prevision Social, Trabajo Y Agricultura' cover franked with 1929 10c brown and 1s blue AIR issue (SG 460 & 463) tied by large QUITO cds dated DEC 1 1929. Sent airmail to PANAMA with boxed 'AGENCIA DE PANAMA SERVICIO DE CORREO AEREO PANAMA' arrival mark on front and COLON Transit and PANAMA arrival cds's on reverse.